1 /* $NetBSD: kvm_x86_64.c,v 1.8 2010/09/20 23:23:16 jym Exp $ */ 2 3 /*- 4 * Copyright (c) 1989, 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software developed by the Computer Systems 8 * Engineering group at Lawrence Berkeley Laboratory under DARPA contract 9 * BG 91-66 and contributed to Berkeley. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #if defined(LIBC_SCCS) && !defined(lint) 38 #if 0 39 static char sccsid[] = "@(#)kvm_hp300.c 8.1 (Berkeley) 6/4/93"; 40 #else 41 __RCSID("$NetBSD: kvm_x86_64.c,v 1.8 2010/09/20 23:23:16 jym Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 /* 46 * x86-64 machine dependent routines for kvm. 47 */ 48 49 #include <sys/param.h> 50 #include <sys/user.h> 51 #include <sys/proc.h> 52 #include <sys/stat.h> 53 #include <sys/kcore.h> 54 #include <sys/types.h> 55 56 #include <stdlib.h> 57 #include <unistd.h> 58 #include <nlist.h> 59 #include <kvm.h> 60 61 #include <uvm/uvm_extern.h> 62 63 #include <limits.h> 64 #include <db.h> 65 66 #include "kvm_private.h" 67 68 #include <machine/kcore.h> 69 #include <machine/pmap.h> 70 #include <machine/pte.h> 71 #include <machine/vmparam.h> 72 73 void 74 _kvm_freevtop(kvm_t *kd) 75 { 76 77 /* Not actually used for anything right now, but safe. */ 78 if (kd->vmst != 0) 79 free(kd->vmst); 80 } 81 82 /*ARGSUSED*/ 83 int 84 _kvm_initvtop(kvm_t *kd) 85 { 86 87 return (0); 88 } 89 90 /* 91 * Translate a kernel virtual address to a physical address. 92 */ 93 int 94 _kvm_kvatop(kvm_t *kd, vaddr_t va, paddr_t *pa) 95 { 96 cpu_kcore_hdr_t *cpu_kh; 97 u_long page_off; 98 pd_entry_t pde; 99 pt_entry_t pte; 100 paddr_t pde_pa, pte_pa; 101 102 if (ISALIVE(kd)) { 103 _kvm_err(kd, 0, "vatop called in live kernel!"); 104 return (0); 105 } 106 107 cpu_kh = kd->cpu_data; 108 page_off = va & PGOFSET; 109 110 /* 111 * Find and read all entries to get to the pa. 112 */ 113 114 /* 115 * Level 4. 116 */ 117 pde_pa = cpu_kh->ptdpaddr + (pl4_pi(va) * sizeof(pd_entry_t)); 118 if (_kvm_pread(kd, kd->pmfd, (void *)&pde, sizeof(pde), 119 _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) { 120 _kvm_syserr(kd, 0, "could not read PT level 4 entry"); 121 goto lose; 122 } 123 if ((pde & PG_V) == 0) { 124 _kvm_err(kd, 0, "invalid translation (invalid level 4 PDE)"); 125 goto lose; 126 } 127 128 /* 129 * Level 3. 130 */ 131 pde_pa = (pde & PG_FRAME) + (pl3_pi(va) * sizeof(pd_entry_t)); 132 if (_kvm_pread(kd, kd->pmfd, (void *)&pde, sizeof(pde), 133 _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) { 134 _kvm_syserr(kd, 0, "could not read PT level 3 entry"); 135 goto lose; 136 } 137 if ((pde & PG_V) == 0) { 138 _kvm_err(kd, 0, "invalid translation (invalid level 3 PDE)"); 139 goto lose; 140 } 141 142 /* 143 * Level 2. 144 */ 145 pde_pa = (pde & PG_FRAME) + (pl2_pi(va) * sizeof(pd_entry_t)); 146 if (_kvm_pread(kd, kd->pmfd, (void *)&pde, sizeof(pde), 147 _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) { 148 _kvm_syserr(kd, 0, "could not read PT level 2 entry"); 149 goto lose; 150 } 151 if ((pde & PG_V) == 0) { 152 _kvm_err(kd, 0, "invalid translation (invalid level 2 PDE)"); 153 goto lose; 154 } 155 156 157 /* 158 * Level 1. 159 */ 160 pte_pa = (pde & PG_FRAME) + (pl1_pi(va) * sizeof(pt_entry_t)); 161 if (_kvm_pread(kd, kd->pmfd, (void *) &pte, sizeof(pte), 162 _kvm_pa2off(kd, pte_pa)) != sizeof(pte)) { 163 _kvm_syserr(kd, 0, "could not read PTE"); 164 goto lose; 165 } 166 /* 167 * Validate the PTE and return the physical address. 168 */ 169 if ((pte & PG_V) == 0) { 170 _kvm_err(kd, 0, "invalid translation (invalid PTE)"); 171 goto lose; 172 } 173 *pa = (pte & PG_FRAME) + page_off; 174 return (int)(NBPG - page_off); 175 176 lose: 177 *pa = (u_long)~0L; 178 return (0); 179 } 180 181 /* 182 * Translate a physical address to a file-offset in the crash dump. 183 */ 184 off_t 185 _kvm_pa2off(kvm_t *kd, paddr_t pa) 186 { 187 cpu_kcore_hdr_t *cpu_kh; 188 phys_ram_seg_t *ramsegs; 189 off_t off; 190 int i; 191 192 cpu_kh = kd->cpu_data; 193 ramsegs = (void *)((char *)(void *)cpu_kh + ALIGN(sizeof *cpu_kh)); 194 195 off = 0; 196 for (i = 0; i < cpu_kh->nmemsegs; i++) { 197 if (pa >= ramsegs[i].start && 198 (pa - ramsegs[i].start) < ramsegs[i].size) { 199 off += (pa - ramsegs[i].start); 200 break; 201 } 202 off += ramsegs[i].size; 203 } 204 205 return (kd->dump_off + off); 206 } 207 208 /* 209 * Machine-dependent initialization for ALL open kvm descriptors, 210 * not just those for a kernel crash dump. Some architectures 211 * have to deal with these NOT being constants! (i.e. m68k) 212 */ 213 int 214 _kvm_mdopen(kvm_t *kd) 215 { 216 217 kd->usrstack = USRSTACK; 218 kd->min_uva = VM_MIN_ADDRESS; 219 kd->max_uva = VM_MAXUSER_ADDRESS; 220 221 return (0); 222 } 223